Animation with no smoothing between keyframes
The default interpolation
 between keyframes is bézier, which will make smooth motions that start from 0, accelerate and decelerate before stopping or changing direction.

 

Interpolation can be changed in the curve editor (or the dopesheet editor) to be constant, meaning that there will be no in-between transformation between keyframes: Elements will remain unchanged until the next keyframe.



To change interpolation, select the keyframes, press the T key
and select constant.

To change interpolation permanently, open the system preferences (Ctrl+Alt+U), and in the editing section set the interpolation you want to use.